Stationery, general (unused)
MLA
Dreier, Katherine S. (Katherine Sophie), 1877-1952. Stationery, general (unused). Box 90, folder 2333. n.d.. https://collections.library.yale.edu/catalog/2012066.
APA, 6th edition
Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 90, folder 2333"])(n.d.)[Stationery, general (unused)]. https://collections.library.yale.edu/catalog/2012066.